Carnelian
Quartz var. Carnelian · Semi-Precious Gemstone
Crystal System
Trigonal, with microcrystalline quartz habit typically forming massive, nodular, or tumbled chip shapes
Mineral Group
Silicates
Chemical Formula
SiO2
Formation Process
Low-temperature hydrothermal deposition or sedimentary precipitation within cavities of pre-existing rocks
About This Crystal
The specimen consists of tumbled, irregular chip-shaped beads of translucent to sub-translucent carnelian strung onto a cord with knotted spacers. The stones display a warm brownish-orange to reddish-orange color with a waxy to vitreous luster and smooth polished surfaces.
Physical Characteristics
Orange to reddish-brown body color, white streak, conchoidal fracture with no distinct cleavage, specific gravity around 2.65, brittle tenacity, and generally inert to weak fluorescence under UV light
Optical Properties
Singly or doubly refractive microcrystalline aggregate, refractive index of approximately 1.544 to 1.553, low birefringence, and generally non-pleochroic
Hardness & Durability
Origin Region
Brazil, India, Madagascar, Uruguay, and the United States, typically found in volcanic and sedimentary environments
Hardness & Durability
Mohs hardness of 7, making it durable and suitable for everyday jewelry wear such as necklaces and bracelets, with good toughness due to its microcrystalline structure
Care & Maintenance
Clean with warm soapy water and a soft brush, avoiding harsh chemicals, ultrasonic cleaners, and prolonged exposure to direct sunlight to prevent potential color alteration
Rarity & Value
Common to uncommon depending on color saturation and clarity; widely available in commercial-grade tumbled chip form with accessible price points, frequently heat-treated or dyed to enhance color
Special Characteristics
Microcrystalline structure composed of interlocking quartz and moganite fibers, often displaying characteristic cloudy color zoning and distributed iron oxide inclusions responsible for the orange hue
Lore & History
Historically used by ancient civilizations including the Egyptians, Romans, and Greeks for signet rings, talismans, and burial offerings. In modern metaphysical practices, carnelian is traditionally associated with the sacral chakra, vitality, creativity, and motivation, though these are cultural beliefs rather than scientific claims.